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    <div style="height:50px; width:250px; border:3px dotted red">Python网络爬虫从入门到精通</div>
    <h1>第 1 章　Python入门</h1>
    <h2>1.1　搭建Python编程环境</h2>
    <h3>1.1.1　安装Python解释器</h3>
    <p>Python是一种动态的编程语言。</p>
    <p>Python是一种<span style="font-weight:bold; font-style:italic">动态</span>的编程语言。</p>
    <ul>
        <li>内置模块</li>
        <li>第三方模块</li>
        <li>自定义模块</li>
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        <li>内置模块</li>
        <li>第三方模块</li>
        <li>自定义模块</li>
    </ol>
    <p><a href="https://www.python.org/">Python官方网站</a></p>
    <p><img src="https://www.python.org/static/img/python-logo.png" alt="Python"></p>
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